If the electronic configuration of metal A is (2, 8, 1) and that of metal B is (2, 8, 2) then:

a. Which metal is less reactive?

Ans. Metal B is less reactive.

b. Write the names of the two metals.

Ans. Metal A is sodium & Metal B is magnesium.

c. Write the balanced chemical equation of reaction of any one metal with hydrochloric acid.

Ans. Mg(s) + 2HCl(aq) ----------> MgCl2(aq)  + H2(g)